A cobfobation of



' Nov. 9, 1926.

J. T. AUGER BRAKE Original Filed Dec. 416. 1921 atlozneg Reiuued Nov. 9, 1926.

UNITED STATES PATENT OFFICE.'

JOSEPH '1. AUGER, OI MINNEAPOLIS, MINNESOTA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO BENDIX BRAKE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF rumors BRAKE.

Original No. 1,506,968, dated September 2, 1924, Serial No. 522,760, filed December 16, 1921.

Application lor' reisaue filed July 18, 1925. Serial No. 44,085

My invention relates to brakes and particularly to brakes for, use in connection with motor vehicles. While designed especially for application to motor vehlcles, it will be obvious that the brake may be used in other relations. An object is to rovide a construction embodying a brake and which not the operating means at the beginning of its movement is positioned in such manner as to cause uniform operation of the brake band for its entire circumference. By means of the equalizing device which I provide, any such defect in operation is quickly overcome before the brake is set to an appreciable extent. The result of thismanner of operating the brake is to prevent. unequal wear of the braking surfaces and to obtain a much more efiicient braking action. Another object is to provide a single brake drum with which cooperates a pair of brake bands which maybe utilized as a service brake and an emergency brake, and both of which operate in accordance with the principle above stated.

The full objects and advantages of my invention will appear in connection with the detailed description, and the novelfeatures embodied in my inventive idea will be pointed out in the claims.

In the accompanying drawings which illustrate the application of my invention in one of the forms in which it'may be embodied, Figure 1 is a view of the brake mostly in central section. Figure 2i: a view in section on the line 2-2 of Figure 1. Figure 3 is a view in section on the line 3-3 of Figure 1. p 0

Referring to the construction illustrated 1n the drawings in which my brake is shown in connection with a wheel of a motor ve hicle, the numeral designates the axle upon which is mounted a rear wheel having a hub 12 provided with an annularilange 1 1. A brake drum 16 is provided with an inwardl extending annular flange 18 and this bra e drum is secured to the wheel by bolts 20 passing through the flange 18 through the spokes 22 and through the flange 14. Connected with the frame of the motor vehicle is a support 24 through which the axle 10 extends and which holds the bearing therefor. It will be understood that the same construction may be provided at both ends of the axle and hence, it will be sufficient to disclose only the construction employed in connection with one of the rear wheels. Adapted to cooperate with the internal surface of the brake drum 16 is an internal brake band 26 which extends for nearly a complete circumference, and, at its ends is provided with inwardly extending flanges 28 and 30 which are spaced from each other sufficiently so that a double ended cam 32 engages the adjacent faces of the flanges.

This cam is provided with a slot 34 which receives a flattened portion 36 on the end of a rod 38 which is rotatably mounted in a bearing39 carried by an extension of the support 24. The slot 34 is longer than the width of the flat portion 36 so as: to consti tute an equalizing slot as will more fully appear in connection with the statement of operation, The shaft 38 may be rocked-to operate the cam 32 in customary manner by means located within reach of the driver when the brake is applied to a motor vehicle. Secured to the middle portion of the brake band 26 is an inwardly extending yoke member 40 which fits slidably upon an arm 42 secured to an extended portion of the sup band is forced into braking position, the

spring 46 is readily compressed so that the whole interior surface of the band may be engaged with the drum. crate with the external surface of the brake drum 16 is an external brake band48 which extends for nearly a complete Circumference and at its ends is provided with pairs of ears 50 and 52. These ears carry pins 54 and 56 respectively which are received in slots formed in the inner ends of lever arms 58 i and (30. Adjustable set bolts 63 and 65 serve to adjustably hold the ends of the levers 58 and (30. These levers are pivotally attached at 62 and (Set to a lag 66 which is carried by an extension of the support 24. As will be apparent from Figures 2 and 3, the lug 66 has angular portions through which the bolts 63 and 65 are threaded and held in adjusted positions by lock nuts.. The outer ends of the levers 58 and 60 are spaced from each other sutficiently to receive between them a double ended cam 68 which has a slot 70 to receive a flattened portion 72 on the end of a rod 74 which is rotatably mounted in a hearing T6 carried by the extended portion of the support 2%. A spring 'TT-between the inner arms of the levers 58 and (30 holds the outer arms thereof in engagement with the cam (58, The slot T0 is longer than the width of the fiat portion 7:2-so as to form an equalizing slot in similar manner to the slot .i-t previously mentioned. The shaft 74 may be rocked to operate the cam 68 in customary manner by means located within reach of the driver when the brake is used in connection with a motor vehicle. Secured to the middle portion of the brake band 48 is an outwardly extending yoke member 78 which fits slidably upon an arm 80 secured to the extended portion of the support 24, Extending slidably through the end portion of the yoke member 78 is a bolt 82, the inner portion of which is threaded into the arm 80. A spring 84: interposed between the arm 80 and the end portion of the yoke member serves to hold the adjacent portion of the brake band from contact with the external surface of the brake drum when the band is not operated,

but, when the band is forced into braking position, the spring 84 is readily compressed so that the whole interior surface of the band may be engaged with the drum.

The operation and advantages of my invention will be obvious from the'foregoing description. In case the brake is applied to a motor vehicle, one of the brake bands may be operated by foot power to constitute a service brake while the other brake band may be operated by a hand lever to constitute an emergency-brake. It is obvious that for some purposes either the internal brakeband or the external brake band maybe mounted alone for operation with the brake drum. The slots 34 and 70 constitute what I term equalizing slots. The cams 32 and 68 When the brake is off will ordinarily oc- Adapted to coopcupy a position such that the flattened portions 36 and 72 will be centrally located in the slots. lVhen the cams are rotated to apply-the brakes, they may slide in either direction sulliciently to insure equalization of the-force with which the two semi-circular positions of the bands are applied. The

;manner in which the middle portions of the bands are supported allows the bands to be brought into contact with the brake drum with a forceequally distributed around this drum. This prevents unequal \i'earing of the braking surface of the bands and results in extremely efiicient braking action. It is obvious that any suitable brake lining may be employed to constitute the braking surface of the bands. \Vlicn the cams 32 and 68 are placed in their nonbraking position, the springs 46 and 8% are of the proper strength and so adjusted that the brake bands are rcmoved from engagement with the brake drum substantially uniformly around its surface.

I claim:

1. A brake comprising a brake drum, a brake band arranged to cooperate thclcwitln said band extendingfor nearly a compiete circumference, means for resiliently holding the middle portion of said band, said means operating to remove said band from engagement with said drum when the brake is oil and. to permit said band to move intoengagement with said drunrwhcn the brake is on, cars secured to the respective ends of said band, pins carried by said ears, levers intermediately pivoted to a fixed support, the inner arms of said levers having slots which receive said pins, a double-ended cam between the outer arms of said levers. a spring for holding'said outer arms in engagement with said cam, said cam having a slot, and an operating member constituting an equalizing device which causes all portions of said band to be applied with equal force to said drum.

2. A brake comprising a brake drum, a brake band arranged to encircle said drum, said band extending for nearly a complete circumference, levers intermediately pivoted to a fixed support and connected at. their ends respectively to the ends of said brake band, and an equalizing device engaging the opposite ends of said levers and moving them in opposite directions to contract said band in a manner to cause all portions of the band to be applied with equal force to said drum.

3. A brake comprising a brake drum, a brake band arranged to encircle said drum, said band extending for nearly a complete circumference, levers intermediately pivoted to a fixed support and connected at their ends respectively to the ends of said brake band, anchoring means engaging an intermediate part of the band, and an equalizing decrumed on a fixe band to be vice for moving the opposite ends of said levers to spread them apart to contract said band in a manner to cause all portions of the applied with equal' force to said 4. A brake comprising a brake drum, a brake band arranged to encircle said drum, said band extending for nearly a complete circumference, levers connected at their ends respectively to the ends of said brake band, and an e ualizing device engaging the opposite ends of said levers to move them in opposite directions to contractsaid band in a manner to cause all portions of the band to be applied with equal force to said drum.

'5. A brake com rising, in combination, a drum, an externa contracting band encircling the drum, a pair of levers, each connected to one end of the band, and means to apply equal pressures to the free ends of the two levers to force them apart, to contract the band against the drum.

6. A brake com rising, in combination, a drum, an externa contracting band encirclingthe drum, a pair of levers, each fulcrumed on afixed su port and connected to one end of the ban and means to apply equal pressures to the free ends of the two levers to force them apart, to contract the band against the drum.

7. A brake com. rising, in combination, a drum, an externa contracting band encircling the drum, a pair of levers, each fulcrumed on a fixed support, anchoring means engaging an intermediate part of the band, and means to apply ual pressures tothe free ends of the two l 8.'A brake comprising, in combination, a

drum, an external contracting band 'enc-ir-' cling the drum, a pair of levers, extending generally radiall of the drum, each fulsu port and connected to one end of the band against the drum when their free en s are spread apart, and means to apply equal pressures tothe free ends of the two levers to force them apart, to contract the band against the drum. -v

9.. A brakecomprising, in combination, a rotatable drum, a stationary support adjacent the open side, of the drum, an external contracting band enclrchng the drum, means for transmitting the bra ing torque from the band to the support, a pair oflevers fulcrumed on part of the support and connected respectively to opposite ends of the band and arranged to contract the band when their brake. evers to force them apart, to contract the band againstthe drum.

to contract the band free ends are spread apart, and means for spreading the free ends of the levers apart.

' 10. Abrake comprising, in combination, a rotatable drum, a Stationary support adjacent the open side of the drum, an external contracting band encircling the drum, means for transmitting the braking torque fro-m the band to the support, a pair of levers fulof levers iulcrumed intermediate their ends on said support and connected at their ends to the ends of said. retarding device to operate it when their free ends are spread apart, and balanced means for applying equal pressures to the free ends of the levers to spread them apart to apply the brake.

12. A brake comprising, in combination, a rotatable dram, an adjacent stationary sup. port, an expansible and contractable retardmg device engageable with said drum, a pair of levers fulcrumed on said support and vice to operate it when their free ends are spread a art, and balanced means for applylevers to spread them apart to apply the 13; A brake comprising, in combination, a rotatable drum, an adjacent stationaryc support, ,an expansible and contractable retarding device en pair of levers ulcrumed on said support and connected to the ends of said retarding device to operate it when their free ends are spread apart, and a floating cam-for applying equal-pressures to the free ends of the levers to spread them apart to apply the brake. 14. Retarding means and operating con nections therefor including a pair of levers having adjacent ends, a cam between the ends of the levers for forcing them apart, and a rockshaft for operating the cam, the cam being arranged to float across the axis of the rockshaft to equalizethe pressures on the two levers.

In witness whereof I have hereunto sub-' scribed my name.

JOSEPH T. AUGER.

connected to the ends of said retarding deing equa pressures to the free'ends of the geable with said drum, a 

